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nominally

it is the 42nd parallel between the 34th & 37th meridians west of Washington DC

but as actually surveyed

it runs from about 2 minutes & 45 seconds west of the 111th meridian

to about 2 minutes & 26 seconds west of the 114th meridian

west longitude

& wanders between about 6 seconds north & about 47 seconds south of the true 42nd parallel

in the nad83 aka wgs84 datum

& it could be & probably has been reckoned more absolutely & summarized better by someone with the right equipment & ability

& may even be available from official sources in boise & or salt lake & or dc

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14y ago

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